Measurement of spin-flip scattering and photon echo response in GaMnAs

Kimberley C. Hall; Daniel Webber; Murat Yildirim; Sam A. March; Reuble Mathew; Angela Gamouras; Margaret Dobrowolska; Xinyu Liu; Jacek K. Furdyna

doi:10.1117/12.2018902

26 September 2013 Measurement of spin-flip scattering and photon echo response in GaMnAs

Kimberley C. Hall, Daniel Webber, Murat Yildirim, Sam A. March, Reuble Mathew, Angela Gamouras, Margaret Dobrowolska, Xinyu Liu, Jacek K. Furdyna

Author Affiliations +

Proceedings Volume 8813, Spintronics VI; 88132V (2013) https://doi.org/10.1117/12.2018902
Event: SPIE NanoScience + Engineering, 2013, San Diego, California, United States

Abstract

Four-wave mixing techniques are applied to Ga_1-xMn_xAs, providing new insight into the fundamental properties of the III-Mn-V semiconductors. Clear signatures of (s,p)-d hybridization associated with the Mn_Ga substitutional impurity are observed in the spectrum of the four-wave mixing signal. Experiments on a ferromagnetic sample show no evidence of hole occupation in the valence band for x = 5%. A photon echo is observed on the interband transition, despite the strong exchange coupling and large defect density in this system. Rapid dephasing associated with Mn-hole spin-flip scattering is observed, with a measured upper bound on the spin-flip scattering time of 40 fs. An excitonic signature tied to many-body effects is observed in LT-GaAs.

Citation Download Citation

Kimberley C. Hall, Daniel Webber, Murat Yildirim, Sam A. March, Reuble Mathew, Angela Gamouras, Margaret Dobrowolska, Xinyu Liu, and Jacek K. Furdyna "Measurement of spin-flip scattering and photon echo response in GaMnAs", Proc. SPIE 8813, Spintronics VI, 88132V (26 September 2013); https://doi.org/10.1117/12.2018902

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